Complete Comparison of GPT and Claude Prompt Caching Billing: 5 Core Differences and the Real Cost Impact of the 1.25x Write Premium
Prompt Caching is arguably the most critical cost-related topic for every Large Language Model API user in 2026. For a RAG application running an 8K system prompt, the difference in monthly bills between having caching enabled and disabled can easily exceed 10x. However, many developers switching between OpenAI and Anthropic get tripped up by a…